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<h3>
Ryan Scott pushed to branch wip/T16762
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b86509270227dbc61f0700c7d9261a4c7672361">8b865092</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-23T14:12:53+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not print synonyms in :i (->), :i Type (#18594)
This adds a new printing flag `sdocPrintTypeAbbreviations` that is used
specifically to avoid ghci printing 'type (->) = (->)' and 'type Type = Type'.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8f61182c3bdd1b6121c83be632b4941b907de88">d8f61182</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-23T14:12:56+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move pprTyTcApp' inside pprTyTcApp
No semantic change
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/364258e0ad25bc95e69745554f5ca831ce80baf8">364258e0</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-24T00:32:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix types in silly shifts (#18589)
Patch written by Simon. I have only added a testcase.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b1eb38a0a7168d7612c791c4289cc02d900d402f">b1eb38a0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-24T00:33:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Perf: make SDoc monad one-shot (#18202)
With validate-x86_64-linux-deb9-hadrian:
T1969 -3.4% (threshold: +/-1%)
T3294 -3.3% (threshold: +/-1%)
T12707 -1.4% (threshold: +/-1%)
Additionally with validate-x86_64-linux-deb9-unreg-hadrian:
T4801 -2.4% (threshold: +/-2%)
T13035 -1.4% (threshold: +/-1%)
T13379 -2.4% (threshold: +/-2%)
ManyAlternatives -2.5% (threshold: +/-2%)
ManyConstructors -3.0% (threshold: +/-2%)
Metric Decrease:
T12707
T1969
T3294
ManyAlternatives
ManyConstructors
T13035
T13379
T4801
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a77b9ec2a6153065565bca7bb154fff35b830b82">a77b9ec2</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-24T10:04:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a test for #18397
The bug was fixed by !3421.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05550a5abc369e1cc4fc48def532ca9ba9adcad7">05550a5a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-24T10:04:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid roundtrip through SDoc
As found by @monoidal on https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3885#note_295126
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a1ecc5fd45a46372c3935df596f05432db1b270">0a1ecc5f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-25T07:37:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools.Process: Handle exceptions in readCreateProcessWithExitCode'
In #18069 we are observing MVar deadlocks from somewhere in ghc.exe.
This use of MVar stood out as being one of the more likely culprits.
Here we make sure that it is exception-safe.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db8793ad417ebfcb57d42e8111674a90706a7918">db8793ad</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-08-25T07:37:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use tcView, not coreView, in the pure unifier.
Addresses a lingering point within #11715.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb77207a23deade8e3f8598c34598535711264cc">fb77207a</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-08-25T07:38:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use LIdP rather than (XRec p (IdP p))
This patch mainly just replaces use of
XRec p (IdP p)
with
LIdP p
One slightly more significant change is to parameterise
HsPatSynDetails over the pass rather than the argument type,
so that it's uniform with HsConDeclDetails and HsConPatDetails.
I also got rid of the dead code GHC.Hs.type.conDetailsArgs
But this is all just minor refactoring. No change in functionality.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8426a1364ba450fe48fc41a95b2ba76c8d1bb7c8">8426a136</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-25T07:38:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a test for #18585
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d635a50b81732b2512b68c652aee36f489b5969">2d635a50</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-26T04:50:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">linters: Make CPP linter skip image files
This patch adds an exclusion rule for `docs/users_guide/images`,
to avoid lint errors of PDF files.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7d98cb2606997e05ad6406929dae3aba746fbb9">b7d98cb2</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-26T04:50:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Color the logo on the front page of the PDF
This patch updates the logo with a recent color scheme.
This affects only the PDF version of the user's guide.
See also:
* https://mail.haskell.org/pipermail/ghc-devs/2020-August/019139.html
* https://gitlab.haskell.org/ghc/ghc/-/wikis/logo
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b17fa185aec793861364afd9a05aa4219fbc019">0b17fa18</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-26T04:50:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnitId pretty-printing
When we pretty-print a UnitId for the user, we try to map it back to its
origin package name, version and component to print
"package-version:component" instead of some hash.
The UnitId type doesn't carry these information, so we have to look into
a UnitState to find them. This is why the Outputable instance of
UnitId used `sdocWithDynFlags` in order to access the `unitState` field
of DynFlags.
This is wrong for several reasons:
1. The DynFlags are accessed when the message is printed, not when it is
generated. So we could imagine that the unitState may have changed
in-between. Especially if we want to allow unit unloading.
2. We want GHC to support several independent sessions at once, hence
several UnitState. The current approach supposes there is a unique
UnitState as a UnitId doesn't indicate which UnitState to use.
See the Note [Pretty-printing UnitId] in GHC.Unit for the new approach
implemented by this patch.
One step closer to remove `sdocDynFlags` field from `SDocContext`
(#10143).
Fix #18124.
Also fix some Backpack code to use SDoc instead of String.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc476a5040cdc64c177de0f78edaafec0972cff4">dc476a50</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-26T04:51:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: fix BigNat subtraction (#18604)
There was a confusion between the boolean expected by
withNewWordArrayTrimedMaybe and the boolean returned by subtracting
functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fcb10b6c69e388d8c6e777baf39920e2cc694501">fcb10b6c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-08-26T10:42:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PPC and X86: Portable printing of IEEE floats
GNU as and the AIX assembler support floating point literals.
SPARC seems to have support too but I cannot test on SPARC.
Curiously, `doubleToBytes` is also used in the LLVM backend.
To avoid endianness issues when cross-compiling float and double literals
are printed as C-style floating point values. The assembler then takes
care of memory layout and endianness.
This was brought up in #18431 by @hsyl20.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/770100e0266750a313b34a52a60968410fcf0769">770100e0</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-26T10:43:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">primops: Remove Monadic and Dyadic categories
There were four categories of primops: Monadic, Dyadic, Compare, GenPrimOp.
The compiler does not treat Monadic and Dyadic in any special way,
we can just replace them with GenPrimOp.
Compare is still used in isComparisonPrimOp.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01ff8c89727a91cbc1571ae54f73f5919d6aaa71">01ff8c89</a></strong>
<div>
<span>by Aditya Gupta</span>
<i>at 2020-08-27T14:19:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Consolidate imports in getMinimalImports (#18264)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bacccb73c9b080c3c01a5e55ecb0a00cd8a77e55">bacccb73</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-08-27T14:20:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make {hsExpr,hsType,pat}NeedsParens aware of boxed 1-tuples
`hsExprNeedsParens`, `hsTypeNeedsParens`, and `patNeedsParens`
previously assumed that all uses of explicit tuples in the source
syntax never need to be parenthesized. This is true save for one
exception: boxed one-tuples, which use the `Solo` data type from
`GHC.Tuple` instead of special tuple syntax. This patch adds the
necessary logic to the three `*NeedsParens` functions to handle
`Solo` correctly.
Fixes #18612.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c6f50cea42a9ffc947bf4243986663cc820b0ec8">c6f50cea</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-28T02:22:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing primop documentation (#18454)
- Add three pseudoops to primops.txt.pp, so that Haddock renders
the documentation
- Update comments
- Remove special case for "->" - it's no longer exported from GHC.Prim
- Remove reference to Note [Compiling GHC.Prim] - the ad-hoc fix is no
longer there after updates to levity polymorphism.
- Document GHC.Prim
- Remove the comment that lazy is levity-polymorphic.
As far as I can tell, it never was: in 80e399639,
only the unfolding was given an open type variable.
- Remove haddock hack in GHC.Magic - no longer neccessary after
adding realWorld# to primops.txt.pp.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f065b6b012fb8f73689bc5c2a4904d5e6e377af8">f065b6b0</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-08-28T02:23:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix use distro toolchian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4517a38215eb72a4824c72d97377b9325059bf55">4517a382</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-08-28T02:23:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">document how build system find toolchains on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/329f7cb958551f5b384e2765a823770150152da2">329f7cb9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-31T22:59:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Better error message on invalid getSystemTimerManager call
Previously we would produce a rather unhelpful pattern match failure
error in the case where the user called `getSystemTimerManager` in a
program which isn't built with `-threaded`. This understandably confused
the user in #15616.
Fixes #15616.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6d70a8ff6a6cd628738fec902fc984936105264">f6d70a8f</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-08-31T22:59:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests for #15617.
Avoid a similar regression in the future.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5969fd06ad4b4c31a8bdce51d35f9aa05594b49">e5969fd0</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-08-31T23:00:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add additional tests for #18172 (Followup MR 3543)
There was still one active discussion [thread](https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3543#note_284325) when MR !3543 got merged.
This MR adds the requested tests exercising the changes in
`compiler/GHC/HsToCore/Match/Literal.hs:warnAboutEmptyEnumerations` and its sub-functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe18b4825c3289089a65b7b16b25e9d216a5b0fd">fe18b482</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-31T23:01:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Win32 and process submodules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2da933084b766fc424b11f5b671574d4c7317134">2da93308</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:01:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix slow-validate flavour (#18586)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85e13008fb9a319c0b79db7c626f37bf20731beb">85e13008</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-08-31T23:02:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update dominator code with fixes from the dom-lt package.
Two bugs turned out in the package that have been fixed since.
This MR includes this fixes in the GHC port of the code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dffb38fab00ac1cd1cbc75156abcf373976581f7">dffb38fa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-08-31T23:02:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Dominators.hs: Use unix line endings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6189cc04ca6c3d79126744e988b487f75ccef9e2">6189cc04</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-08-31T23:02:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[fixup 3433] move debugBelch into IF_DEBUG(linker)
The commit in dff1cb3d9c111808fec60190747272b973547c52 incorrectly left
the `debugBelch` function without a comment or IF_DEBUG(linker,)
decoration. This rectifies it.
Needs at least a 8.10 backport, as it was backported in 6471cc6aff80d5deebbdb1bf7b677b31ed2af3d5
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcb68a3f7f85b9fdef6f4845e608d086b01e6a58">bcb68a3f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:03:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't store HomeUnit in UnitConfig
Allow the creation of a UnitConfig (hence of a UnitState) without having
a HomeUnit. It's required for #14335.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a3723876c6c79a0a407d50f4baa2818a13f232e">0a372387</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:04:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix documentation and fix "check" bignum backend (#18604)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb85f125a227f6b5703d4a2e997c5ea320dfa31f">eb85f125</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-08-31T23:04:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Set the dynamic-system-linker flag to Manual
This flag should be user controllable, hence Manual: True.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/380ef84587fb6890d100c338d1992a6994a4f02a">380ef845</a></strong>
<div>
<span>by Sven Tennie</span>
<i>at 2020-08-31T23:05:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ignore more files
Ignore files from "new style" cabal builds (dist-newstyle folders) and
from clangd (C language server).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74a7fbff5a8f244cd44345bf987e26413bb1989e">74a7fbff</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-31T23:05:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Limit upper version of Happy for ghc-9.0 and earlier (#18620)
This patch adds the upper bound of a happy version for ghc-9.0
and earlier.
Currently, we can't use happy-1.20.0 for ghc-9.0.
See #18620.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4473f02ae2e685601e257b8668bea2ec721b294">a4473f02</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-31T23:05:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Limit upper version of Happy for ghc-9.2 (#18620)
This patch adds the upper bound of a happy version for ghc-9.2.
Currently, We can use happy-1.19 or happy-1.20 for ghc-9.2.
See #18620.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8a2568b7b64e5b9fca5b12df7da759de4db39ae">a8a2568b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:06:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add BigNat compat functions (#18613)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/884245dd29265b7bee12cda8c915da9c916251ce">884245dd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-01T12:39:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix FastString lexicographic ordering (fix #18562)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b4fbc58d37d37457144014ef82bdd928de175df">4b4fbc58</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-01T12:39:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove "Ord FastString" instance
FastStrings can be compared in 2 ways: by Unique or lexically. We don't
want to bless one particular way with an "Ord" instance because it leads
to bugs (#18562) or to suboptimal code (e.g. using lexical comparison
while a Unique comparison would suffice).
UTF-8 encoding has the advantage that sorting strings by their encoded
bytes also sorts them by their Unicode code points, without having to
decode the actual code points. BUT GHC uses Modified UTF-8 which
diverges from UTF-8 by encoding \0 as 0xC080 instead of 0x00 (to avoid
null bytes in the middle of a String so that the string can still be
null-terminated). This patch adds a new `utf8CompareShortByteString`
function that performs sorting by bytes but that also takes Modified
UTF-8 into account. It is much more performant than decoding the strings
into [Char] to perform comparisons (which we did in the previous patch).
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4edcde70160820dd23c53d9019f895930e2c0e7">b4edcde7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-01T14:53:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add broken test for #18302
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfab2a30be5cc68e7914c3f6bb9ae4ad33283ffc">bfab2a30</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-02T15:54:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Turn on -XMonoLocalBinds by default (#18430)
And fix the resulting type errors.
Co-authored-by: Krzysztof Gogolewski <krz.gogolewski@gmail.com>
Metric Decrease:
parsing001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c30cc0e9c3704b24ad0f6d9a0199bf8b5835bd40">c30cc0e9</a></strong>
<div>
<span>by David Feuer</span>
<i>at 2020-09-02T15:55:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove potential space leak from Data.List.transpose
Previously, `transpose` produced a list of heads
and a list of tails independently. This meant that
a function using only some heads, and only some tails,
could potentially leak space. Use `unzip` to work
around the problem by producing pairs and selector
thunks instead. Time and allocation behavior will
be worse, but there should be no more leak potential.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffc3da474bd6febf8a120ebd432ad69f92fe03e0">ffc3da47</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-02T15:56:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove outdated note
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85e621234916e9b5d40174831a3b422bd99f8f83">85e62123</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-02T15:56:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add missing compat import/export functions
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/397c2b03e90e74c94ff55849adb6aa2a84e3e783">397c2b03</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-03T17:31:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Work around Raspbian's silly packaging decisions
See #17856.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4891c18a49876958b44e50dc6e2f24326d92052f">4891c18a</a></strong>
<div>
<span>by Kathryn Spiers</span>
<i>at 2020-09-03T17:32:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">expected-undocumented-flags remove kill flags
It looks like the flags were removed in https://gitlab.haskell.org/ghc/ghc/-/commit/3e27205a66b06a4501d87eb31e285eadbc693eb7
and can safely be removed here</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d6d648866da9e7754859c48235f8009b8c130fd">1d6d6488</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-04T16:24:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't rely on CLabel's Outputable instance in CmmToC
This is in preparation of the removal of sdocWithDynFlags (#10143),
hence of the refactoring of CLabel's Outputable instance.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89ce7cdf977304cb7d0f325a013f822600c1bfbf">89ce7cdf</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-04T16:24:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: use Platform in foldRegs*
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/220ad8d67af345cf3decf82ff26c1e696d21ac93">220ad8d6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-04T16:24:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: don't pass DynFlags to cmmImplementSwitchPlans
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1e54439be3d38a1f972ac772cca7eec5e1519a9">c1e54439</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-04T16:25:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce isBoxedTupleDataCon and use it to fix #18644
The code that converts promoted tuple data constructors to
`IfaceType`s in `GHC.CoreToIface` was using `isTupleDataCon`, which
conflates boxed and unboxed tuple data constructors. To avoid this,
this patch introduces `isBoxedTupleDataCon`, which is like
`isTupleDataCon` but only works for _boxed_ tuple data constructors.
While I was in town, I was horribly confused by the fact that there
were separate functions named `isUnboxedTupleCon` and
`isUnboxedTupleTyCon` (similarly, `isUnboxedSumCon` and
`isUnboxedSumTyCon`). It turns out that the former only works for
data constructors, despite its very general name! I opted to rename
`isUnboxedTupleCon` to `isUnboxedTupleDataCon` (similarly, I renamed
`isUnboxedSumCon` to `isUnboxedSumDataCon`) to avoid this potential
confusion, as well as to be more consistent with
the naming convention I used for `isBoxedTupleDataCon`.
Fixes #18644.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/07bdcac38c90e79db9e4327f87c5400630dfe74b">07bdcac3</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-09-04T22:26:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Avoid hard-coded ld path on Windows
The fix to #17962 ended up regressing on Windows as it failed to
replicate the logic responsible for overriding the toolchain paths on
Windows. This resulted in a hard-coded path to a directory that likely
doesn't exist on the user's system (#18550).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0be8e746b820662a09bf9e406bb7e86da3b548e6">0be8e746</a></strong>
<div>
<span>by Benjamin Maurer</span>
<i>at 2020-09-04T22:27:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Documented the as of yet undocumented '--print-*' GHC flags,
as well as `-split-objs`, since that is related to
`--print-object-splitting-supported`.
See #18641
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4813486f8756fde7889b214e6e41ae63465f7ad7">4813486f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-04T22:27:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Hadrian's wiki pages in tree (fix #16165)
Only the debugging page contains interesting stuff. Some of this stuff
looks old (e.g. recommending "cabal install")...
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7980ae23696f2406c65ee498155b26c09d3d4394">7980ae23</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-09-05T14:50:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Consistently use stgMallocBytes instead of malloc
This can help in debugging RTS memory leaks since all allocations go
through the same interface.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67059893a232e682aa5eca7a3d13042b1c884d55">67059893</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-05T14:51:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix whitespace
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be2cc0ad2109894d2f576c73e3f037b6b79a6bdc">be2cc0ad</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-05T14:51:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: More intelligent detection of locale availability
Previously ci.sh would unconditionally use C.UTF-8. However, this fails
on Centos 7, which appears not to provide this locale. Now we first try
C.UTF-8, then try en_US.UTF-8, then fail.
Works around #18607.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15dca84793d5ec4ff922726477923e40caa075eb">15dca847</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-05T14:51:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Rename RELEASE variable to RELEASE_JOB
This interfered with the autoconf variable of the same name, breaking
pre-release builds.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bec0d1701673a80d9517acabf559738613ba4e9c">bec0d170</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-05T14:51:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump Windows toolchain version
This should have been done when we bumped the bootstrap compiler to
8.8.4.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9fbaee212ff527c3a91c350c7e54c75c1484d778">9fbaee21</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-05T14:51:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Drop Windows make job
These are a significant burden on our CI resources and end up failing
quite often due to #18274. Here I drop the make jobs during
validaion; it is now run only during the nightly builds.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/869f6e193d302c566ff0fbd530e8427440d0d2e3">869f6e19</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-05T14:51:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Drop Windows-specific output for parseTree
The normalise_slashes normaliser should handle this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c9f743c0d034b1a99b22d48e4ff7a3b6670aaa5">2c9f743c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-05T14:51:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T5975[ab] as broken on Windows
Due to #7305.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/643785e3835de2de6c575e6418db0d4598b72a7d">643785e3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-05T14:51:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix typo
A small typo in a rule regular expression.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5413fc62342f05d48e62f92c81a7f8a3259d3d7">c5413fc6</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-07T09:33:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add clarification regarding poll/kqueue flags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10434d60c62fee7212f08bffde624702f81e93cf">10434d60</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-07T09:34:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Configure bignum backend in Hadrian builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d4bc9f0de7992f60bce403731019829f6248cc2c">d4bc9f0d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-07T09:34:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use hadrian builds for Windows release artifacts
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4ff93292243888545da452ea4d4c1987f2343591">4ff93292</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-09-07T21:18:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[macOS] improved runpath handling
In b592bd98ff25730bbe3c13d6f62a427df8c78e28 we started using
-dead_strip_dylib on macOS when lining dynamic libraries and binaries.
The underlying reason being the Load Command Size Limit in macOS
Sierra (10.14) and later.
GHC will produce @rpath/libHS... dependency entries together with a
corresponding RPATH entry pointing to the location of the libHS...
library. Thus for every library we produce two Load Commands. One to
specify the dependent library, and one with the path where to find it.
This makes relocating libraries and binaries easier, as we just need to
update the RPATH entry with the install_name_tool. The dynamic linker
will then subsitute each @rpath with the RPATH entries it finds in the
libraries load commands or the environement, when looking up @rpath
relative libraries.
-dead_strip_dylibs intructs the linker to drop unused libraries. This in
turn help us reduce the number of referenced libraries, and subsequently
the size of the load commands. This however does not remove the RPATH
entries. Subsequently we can end up (in extreme cases) with only a
single @rpath/libHS... entry, but 100s or more RPATH entries in the Load
Commands.
This patch rectifies this (slighly unorthodox) by passing *no* -rpath
arguments to the linker at link time, but -headerpad 8000. The
headerpad argument is in hexadecimal and the maxium 32k of the load
command size. This tells the linker to pad the load command section
enough for us to inject the RPATHs later. We then proceed to link the
library or binary with -dead_strip_dylibs, and *after* the linking
inspect the library to find the left over (non-dead-stripped)
dependencies (using otool). We find the corresponding RPATHs for each
@rpath relative dependency, and inject them into the library or binary
using the install_name_tool. Thus achieving a deadstripped dylib (and
rpaths) build product.
We can not do this in GHC, without starting to reimplement a dynamic
linker as we do not know which symbols and subsequently libraries are
necessary.
Commissioned-by: Mercury Technologies, Inc. (mercury.com)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df04b81e12dac85292aa18c07e6afac7a8bd2fd5">df04b81e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-07T21:19:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move DynFlags test into updateModDetailsIdInfos's caller (#17957)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea1cbb8f2ac9e077ed19530911c3a35c5f46ee8a">ea1cbb8f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-08T15:42:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add stg_copyArray_barrier to RtsSymbols list
It's incredible that this wasn't noticed until now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7b2f799469a969ad7a2535be57f105186946c40">d7b2f799</a></strong>
<div>
<span>by Daishi Nakajima</span>
<i>at 2020-09-08T15:42:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Output performance test results in tabular format
this was suggested in #18417.
Change the print format of the values.
* Shorten commit hash
* Reduce precision of the "Value" field
* Shorten metrics name
* e.g. runtime/bytes allocated -> run/alloc
* Shorten "MetricsChange"
* e.g. unchanged -> unch, increased -> incr
And, print the baseline environment if there are baselines that were
measured in a different environment than the current environment.
If all "Baseline commit" are the same, print it once.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44472daf500bf862921e89ad45c9741a07a64f61">44472daf</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-08T15:43:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make the forall-or-nothing rule only apply to invisible foralls (#18660)
This fixes #18660 by changing `isLHsForAllTy` to
`isLHsInvisForAllTy`, which is sufficient to make the
`forall`-or-nothing rule only apply to invisible `forall`s. I also
updated some related documentation and Notes while I was in the
neighborhood.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c61cbfff985723240671b54d6f80075e4907e85">0c61cbff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-08T15:43:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Handle distributions without locales
Previously we would assume that the `locale` utility exists. However,
this is not so on Alpine as musl's locale support is essentially
non-existent.
(cherry picked from commit 17cdb7ac3b557a245fee1686e066f9f770ddc21e)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d989c84225090f850591e9f4f82adffbf8c96cac">d989c842</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-08T15:43:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Accept Centos 7 C.utf8 locale
Centos apparently has C.utf8 rather than C.UTF-8.
(cherry picked from commit d9f85dd25a26a04d3485470afb3395ee2dec6464)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5a2899ce8e06b8645946fbb67041807cd3a4fe5">e5a2899c</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-09-09T00:46:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use "to" instead of "2" in internal names of conversion ops
Change the constructors for the primop union, and also names of the
literal conversion functions.
"2" runs into trouble when we need to do conversions from fixed-width
types, and end up with thing like "Int642Word".
Only the names internal to GHC are changed, as I don't want to worry
about breaking changes ATM.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4">822f1057</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-09T00:46:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Postpone associated tyfam default checks until after typechecking
Previously, associated type family defaults were validity-checked
during typechecking. Unfortunately, the error messages that these
checks produce run the risk of printing knot-tied type constructors,
which will cause GHC to diverge. In order to preserve the current
error message's descriptiveness, this patch postpones these validity
checks until after typechecking, which are now located in the new
function `GHC.Tc.Validity.checkValidAssocTyFamDeflt`.
Fixes #18648.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8c892689058912c35ed36e07b5a9ed0df86abc03">8c892689</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-09T11:19:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: add OptCoercionOpts
Use OptCoercionOpts to avoid threading DynFlags all the way down to
GHC.Core.Coercion.Opt
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f32a9c0f4ddceab14a381bfd3732bcad6be43f7">3f32a9c0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-09T11:19:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: add UnfoldingOpts and SimpleOpts
Milestone: after this patch, we only use 'unsafeGlobalDynFlags' for the
state hack and for debug in Outputable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3df72a699727b00d5dd8212fcbe46cbbec05f9b">b3df72a6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-09T11:19:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: add sm_pre_inline field into SimplMode (#17957)
It avoids passing and querying DynFlags down in the simplifier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffae57921168365272bf7ce8aaa645917bfdf218">ffae5792</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-09T11:19:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add comments about sm_dflags and simpleOptExpr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7911d0d983a68eb0d54d7c1ba51326d6be737aae">7911d0d9</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-09-09T11:20:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove GENERATED pragma, as it is not being used
@alanz pointed out on ghc-devs that the payload of this pragma does
not appear to be used anywhere.
I (@bgamari) did some digging and traced the pragma's addition back to
d386e0d2 (way back in 2006!).
It appears that it was intended to be used by code generators for use
in informing the code coveraging checker about generated code
provenance. When it was added it used the pragma's "payload" fields as
source location information to build an "ExternalBox". However, it
looks like this was dropped a year later in 55a5d8d9. At this point
it seems like the pragma serves no useful purpose.
Given that it also is not documented, I think we should remove it.
Updates haddock submodule
Closes #18639
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5aae5b325ccef857800f1840665a0e1b152e9b88">5aae5b32</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-09T18:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump Docker images
We now generate our Docker images via Dhall definitions, as described in
ghc/ci-images!52. Additionally, we are far more careful about where tools
come from, using the ALEX, HAPPY, HSCOLOR, and GHC environment variables
(set in the Dockerfiles) to find bootstrapping tools.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4ce9fe88e7e98178d5fd6b18ac9cba666a1f8306">4ce9fe88</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-09T18:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix leakage of GHC in PATH into build
Previously hadrian would use GHC on PATH when configuring packages (or
fail if there is no such GHC). Fix this. Unfortunately this runs into
another bug in Cabal which we workaround.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/291a15dd8dfc03d493c0db36a9cb62fd4867db10">291a15dd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-09T18:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">utils: Bump cabal-version of hp2ps and unlit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b">4798caa0</a></strong>
<div>
<span>by David Himmelstrup</span>
<i>at 2020-09-09T18:32:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts comment: RTS_TICKY_SYMBOLS moved from rts/Linker.c to rts/RtsSymbols.c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67ce72da1689058cb689ffbb6fcbd5cd12af56df">67ce72da</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T10:35:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add long-distance info for pattern bindings (#18572)
We didn't consider the RHS of a pattern-binding before, which led to
surprising warnings listed in #18572.
As can be seen from the regression test T18572, we get the expected
output now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1207576ac0cfdd3fe1ea00b5505f7c874613451e">1207576a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T10:35:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Big refactor using guard tree variants more closely following source syntax (#18565)
Previously, we desugared and coverage checked plain guard trees as
described in Lower Your Guards. That caused (in !3849) quite a bit of
pain when we need to partially recover tree structure of the input
syntax to return covered sets for long-distance information, for
example.
In this refactor, I introduced a guard tree variant for each relevant
source syntax component of a pattern-match (mainly match groups, match,
GRHS, empty case, pattern binding). I made sure to share as much
coverage checking code as possible, so that the syntax-specific checking
functions are just wrappers around the more substantial checking
functions for the LYG primitives (`checkSequence`, `checkGrds`).
The refactoring payed off in clearer code and elimination of all panics
related to assumed guard tree structure and thus fixes #18565.
I also took the liberty to rename and re-arrange the order of functions
and comments in the module, deleted some dead and irrelevant Notes,
wrote some new ones and gave an overview module haddock.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95455982df1ef15c6d4585a7d3e93b5e75146a07">95455982</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-09-10T10:36:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Don't include -fdiagnostics-color in argument hash
Otherwise the input hash will vary with whether colors are requested,
which changed with `isatty`.
Fixes #18672.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6abe4a1c427a511aa698424055639ea789fccf97">6abe4a1c</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T17:02:00+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">.gitignore *.hiedb files
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3777be14e104f040b826762f5ab42a8b898d85ae">3777be14</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T17:03:12+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Handle ⊥ and strict fields correctly (#18341)
In #18341, we discovered an incorrect digression from Lower Your Guards.
This MR changes what's necessary to support properly fixing #18341.
In particular, bottomness constraints are now properly tracked in the
oracle/inhabitation testing, as an additional field
`vi_bot :: Maybe Bool` in `VarInfo`. That in turn allows us to
model newtypes as advertised in the Appendix of LYG and fix #17725.
Proper handling of ⊥ also fixes #17977 (once again) and fixes #18670.
For some reason I couldn't follow, this also fixes #18273.
I also added a couple of regression tests that were missing. Most of
them were already fixed before.
In summary, this patch fixes #18341, #17725, #18273, #17977 and #18670.
Metric Decrease:
T12227
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bd28931903c2fbc10a4b2ecbf9dffd0a3585ac8">1bd28931</a></strong>
<div>
<span>by David Himmelstrup</span>
<i>at 2020-09-11T09:59:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define TICKY_TICKY when compiling cmm RTS files.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15e67801ee72b94c6c826f641464c6be511685cc">15e67801</a></strong>
<div>
<span>by David Himmelstrup</span>
<i>at 2020-09-11T09:59:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typos in TICKY_TICKY symbol names.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a5a91cb67e8c4e2558031c04efccf3c378ba254">8a5a91cb</a></strong>
<div>
<span>by David Himmelstrup</span>
<i>at 2020-09-11T09:59:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable TICKY_TICKY for debug builds when building with makefiles.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc965c0910757410d624229419f36f0829cf73f6">fc965c09</a></strong>
<div>
<span>by Sandy Maguire</span>
<i>at 2020-09-12T00:31:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add clamp function to Data.Ord
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb6e29e8d19deaf7581fdef14adc88a02573c83e">fb6e29e8</a></strong>
<div>
<span>by Sandy Maguire</span>
<i>at 2020-09-12T00:31:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a9422859e0c079aaa38bb9a760034f887501fce">2a942285</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-12T00:32:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Disattach COMPLETE pragma lookup from TyCons
By not attaching COMPLETE pragmas with a particular TyCon and instead
assume that every COMPLETE pragma is applicable everywhere, we can
drastically simplify the logic that tries to initialise available
COMPLETE sets of a variable during the pattern-match checking process,
as well as fixing a few bugs.
Of course, we have to make sure not to report any of the
ill-typed/unrelated COMPLETE sets, which came up in a few regression
tests.
In doing so, we fix #17207, #18277 and #14422.
There was a metric decrease in #18478 by ~20%.
Metric Decrease:
T18478
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/389a668343c0d4f5fa095112ff98d0da6998e99d">389a6683</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-12T00:32:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Pass input file to makeindex
Strangely I find that on Alpine (and apparently only on Alpine) the
latex makeindex command expects to be given a filename, lest it reads
from stdin.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/853d121acfcdae208e852edacac65a1b3e8cab83">853d121a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-12T00:33:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't quote argument to Hadrian's test-env flag (#18656)
Doing so causes the name of the test environment to gain an extra
set of double quotes, which changes the name entirely.
Fixes #18656.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8440b5fa1397940f2f293935927e690b34110a73">8440b5fa</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-12T00:33:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make sure we can read past perf notes
See #18656.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2157be52cd454353582b04d89492b239b90f91f7">2157be52</a></strong>
<div>
<span>by theobat</span>
<i>at 2020-09-12T21:27:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid iterating twice in `zipTyEnv` (#18535)
zipToUFM is a new function to replace `listToUFM (zipEqual ks vs)`.
An explicit recursion is preferred due to the sensible nature of fusion.
T12227 -6.0%
T12545 -12.3%
T5030 -9.0%
T9872a -1.6%
T9872b -1.6%
T9872c -2.0%
-------------------------
Metric Decrease:
T12227
T12545
T5030
T9872a
T9872b
T9872c
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69ea2fee35b4bcfd9253ee608f7135024186aeed">69ea2fee</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-12T21:27:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make `tcCheckSatisfiability` incremental (#18645)
By taking and returning an `InertSet`.
Every new `TcS` session can then pick up where a prior session left with
`setTcSInerts`.
Since we don't want to unflatten the Givens (and because it leads to
infinite loops, see !3971), we introduced a new variant of `runTcS`,
`runTcSInerts`, that takes and returns the `InertSet` and makes
sure not to unflatten the Givens after running the `TcS` action.
Fixes #18645 and #17836.
Metric Decrease:
T17977
T18478
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a77e48d291b35a92731f106d79ea75117ec380e1">a77e48d2</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-12T21:27:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Extract definition of DsM into GHC.HsToCore.Types
`DsM` was previously defined in `GHC.Tc.Types`, along with `TcM`. But
`GHC.Tc.Types` is in the set of transitive dependencies of `GHC.Parser`,
a set which we aim to minimise. Test case `CountParserDeps` checks for
that.
Having `DsM` in that set means the parser also depends on the innards of
the pattern-match checker in `GHC.HsToCore.PmCheck.Types`, which is the
reason we have that module in the first place.
In the previous commit, we represented the `TyState` by an `InertSet`,
but that pulls the constraint solver as well as 250 more modules into
the set of dependencies, triggering failure of `CountParserDeps`.
Clearly, we want to evolve the pattern-match checker (and the desugarer)
without being concerned by this test, so this patch includes a small
refactor that puts `DsM` into its own module.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd5d622a5ee283d3c1f1ccd28b4f73aab30d7d9f">fd5d622a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-12T21:27:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hackily decouple the parser from the desugarer
In a hopefully temporary hack, I re-used the idea from !1957 of using a
nullary type family to break the dependency from GHC.Driver.Hooks on the
definition of DsM ("Abstract Data").
This in turn broke the last dependency from the parser to the desugarer.
More details in `Note [The Decoupling Abstract Data Hack]`.
In the future, we hope to undo this hack again in favour of breaking the
dependency from the parser to DynFlags altogether.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35a7b7ecabeba39e53d6dea78ecc2d3eca8b1b24">35a7b7ec</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-09-14T17:46:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: -B rts option sounds the bell on every GC (#18351)</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ae8212c3d2f284bc18a562625be3f4640984497">5ae8212c</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-14T17:46:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Populate gitlab cache after building
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5ffb39afc386729c821b924dd2c6a93917e1b5f">a5ffb39a</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-14T17:46:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move ahead cabal cache restoration to before use of cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8b37c21fdcb9ca515e3dd2fab1661b7792fb728">e8b37c21</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-14T17:46:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do the hadrian rebuild multicore
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/07762eb5cfe735e131a7f017939a6b0ccfb28389">07762eb5</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-14T17:46:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Also cache other hadrian builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8610bcbeb11b898f85f228b755fa8421b5ae3e34">8610bcbe</a></strong>
<div>
<span>by DenisFrezzato</span>
<i>at 2020-09-15T15:19:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix rtsopts documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7182a5c67fe8b5bd256cb8eb805562636853ea2">c7182a5c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-15T15:19:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Care with implicit-parameter superclasses
Two bugs, #18627 and #18649, had the same cause: we were not
account for the fact that a constaint tuple might hide an implicit
parameter.
The solution is not hard: look for implicit parameters in
superclasses. See Note [Local implicit parameters] in
GHC.Core.Predicate.
Then we use this new function in two places
* The "short-cut solver" in GHC.Tc.Solver.Interact.shortCutSolver
which simply didn't handle implicit parameters properly at all.
This fixes #18627
* The specialiser, which should not specialise on implicit parameters
This fixes #18649
There are some lingering worries (see Note [Local implicit
parameters]) but things are much better.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f3884b0b72fb1e4641450e68f63580c0e86f515">0f3884b0</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-09-15T15:20:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export enrichHie from GHC.Iface.Ext.Ast
This is useful for `ghcide`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3143f5a0827b640840ef241a30933dc23b69d91">b3143f5a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-15T15:21:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enhance metrics output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4283feaa9e0826211f7a71d543054c989ea32965">4283feaa</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-15T15:21:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce and use DerivClauseTys (#18662)
This switches `deriv_clause_tys` so that instead of using a list of
`LHsSigType`s to represent the types in a `deriving` clause, it now
uses a sum type. `DctSingle` represents a `deriving` clause with no
enclosing parentheses, while `DctMulti` represents a clause with
enclosing parentheses. This makes pretty-printing easier and avoids
confusion between `HsParTy` and the enclosing parentheses in
`deriving` clauses, which are different semantically.
Fixes #18662.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6402e67f5c3278cc496326d2d4688592cfb0d4e2">6402e67f</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-16T08:01:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">WIP: T16762
[ci skip]
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#a5cc2925ca8258af241be7e5b0381edf30266302">
.gitignore
</a>
</li>
<li class="file-stats">
<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
</a>
</li>
<li class="file-stats">
<a href="#157f7634c25bc6366cb7c9c9edb48e819dce38db">
.gitlab/ci.sh
</a>
</li>
<li class="file-stats">
<a href="#412267f7d5ed866deae5ac2ca598ff8092b826b6">
.gitlab/linters/check-cpp.py
</a>
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